March 29 » King Gustav III of Sweden dies after being shot in the back at a midnight masquerade ball at Stockholm's Royal Opera 13 days earlier. He is succeeded by Gustav IV Adolf.
July 25 » The Brunswick Manifesto is issued to the population of Paris promising vengeance if the French royal family is harmed.
September 2 » During what became known as the September Massacres of the French Revolution, rampaging mobs slaughter three Roman Catholic bishops, more than two hundred priests, and prisoners believed to be royalist sympathizers.
September 21 » French Revolution: The National Convention abolishes the monarchy.
October 12 » The first celebration of Columbus Day is held in New York City.
October 13 » In Washington, D.C., the cornerstone of the United States Executive Mansion (known as the White House since 1818) is laid.
Day of marriage February 6, 1818
The temperature on February 6, 1818 was about 1.0 °C. Wind direction mainly southwest. Weather type: betrokken mist. Source: KNMI
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De Republiek der Verenigde Nederlanden werd in 1794-1795 door de Fransen veroverd onder leiding van bevelhebber Charles Pichegru (geholpen door de Nederlander Herman Willem Daendels); de verovering werd vergemakkelijkt door het dichtvriezen van de Waterlinie; Willem V moest op 18 januari 1795 uitwijken naar Engeland (en van daaruit in 1801 naar Duitsland); de patriotten namen de macht over van de aristocratische regenten en proclameerden de Bataafsche Republiek; op 16 mei 1795 werd het Haags Verdrag gesloten, waarmee ons land een vazalstaat werd van Frankrijk; in 3.1796 kwam er een Nationale Vergadering; in 1798 pleegde Daendels een staatsgreep, die de unitarissen aan de macht bracht; er kwam een nieuwe grondwet, die een Vertegenwoordigend Lichaam (met een Eerste en Tweede Kamer) instelde en als regering een Directoire; in 1799 sloeg Daendels bij Castricum een Brits-Russische invasie af; in 1801 kwam er een nieuwe grondwet; bij de Vrede van Amiens (1802) kreeg ons land van Engeland zijn koloniën terug (behalve Ceylon); na de grondwetswijziging van 1805 kwam er een raadpensionaris als eenhoofdig gezag, namelijk Rutger Jan Schimmelpenninck (van 31 oktober 1761 tot 25 maart 1825).
January 15 » A paper by David Brewster is read to the Royal Society, belatedly announcing his discovery of what we now call the biaxial class of doubly-refracting crystals. On the same day, Augustin-Jean Fresnel signs a "supplement" (submitted four days later) on reflection of polarized light.
March 16 » In the Second Battle of Cancha Rayada, Spanish forces defeated Chileans under José de San Martín.
April 5 » In the Battle of Maipú, Chile's independence movement, led by Bernardo O'Higgins and José de San Martín, win a decisive victory over Spain, leaving 2,000 Spaniards and 1,000 Chilean patriots dead.
April 19 » French physicist Augustin Fresnel signs his preliminary "Note on the Theory of Diffraction" (deposited on the following day). The document ends with what we now call the Fresnel integrals.
July 29 » French physicist Augustin Fresnel submits his prizewinning "Memoir on the Diffraction of Light", precisely accounting for the limited extent to which light spreads into shadows, and thereby demolishing the oldest objection to the wave theory of light.
October 20 » The Convention of 1818 is signed between the United States and the United Kingdom, which settles the Canada–United States border on the 49th parallel for most of its length.
Day of death April 22, 1869
The temperature on April 22, 1869 was about 17.8 °C. The air pressure was 1 kgf/m2 and came mainly from the southwest. The airpressure was 76 cm mercury. The atmospheric humidity was 39%. Source: KNMI
From June 4, 1868 till January 4, 1871 the Netherlands had a cabinet Van Bosse - Fock with the prime ministers Mr. P.P. van Bosse (liberaal) and Mr. C. Fock (liberaal).
March 24 » The last of Titokowaru's forces surrendered to the New Zealand government, ending his uprising.
April 17 » Morelos is admitted as the 27th state of Mexico.
May 26 » Boston University is chartered by the Commonwealth of Massachusetts.
July 25 » The Japanese daimyōs begin returning their land holdings to the emperor as part of the Meiji Restoration reforms. (Traditional Japanese Date: June 17, 1869).
August 29 » The Mount Washington Cog Railway opens, making it the world's first mountain-climbing rack railway.
November 17 » In Egypt, the Suez Canal, linking the Mediterranean Sea with the Red Sea, is inaugurated.
When copying data from this family tree, please include a reference to the origin: Hans Weening, "Family tree Weening", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-weening/I164936.php : accessed October 25, 2026), "Sietze Alberts Sintniklaas (1792-1869)".
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